You shouldn't have any additional noise. Double check the shifter boot to make sure it's seated properly.
Installed mine last night on jack stands. Install was pretty straight forward. The new support arms threw me off for a second. Also, putting that damn dust cover back on was the hardest part of the whole mod. It was SUCH a PITA!!!!
It's my first after market shifter ever. I'm really impressed so far. Shifts feel solid and it makes me very confident in the hard throws. I did pick up some additional road noise, but nothing that the radio or exhaust won't cover. Still a little notchy from 1st to 2nd, but I think it's a transmission issue more than anything.